SB 4.8.17
dirgham svasanti vrjinasya param
apasyati balakam aha bala
mamangalam tata paresu mamstha
bhunkte jano yat para-duhkhadas tat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
She also was breathing very heavily, and she did not know the factual remedy for the painful situation. Not finding any remedy, she said to her son: My dear son, don’t wish for anything inauspicious for others. Anyone who inflicts pains upon others suffers himself from that pain.